<template>
  <div class="com-container">
    <div class="com-chart" ref="seller_ref"></div>
  </div>
</template>
<script>
import { mapState } from 'vuex'
export default {
  data() {
    return {
      chartInstance: null,
      allData: null, // 服务器返回的数据
      currentPage: 1, // 当前显示的页数
      totalPage: 0, // 一共有多少页
      timerId: null, //定时器的标识
    };
  },
  created() {
    this.$socket.registerCallBack("sellerData", this.getData)
  },
  mounted() {
    this.initChart();
    // this.getData();
    this.$socket.send({
      action: 'getData',
      socketType: 'sellerData',
      chartName: 'seller',
      value: ''
    });
    window.addEventListener("resize", this.sceenAdapter);
    this.sceenAdapter()
  },
  destroyed() {
    clearInterval(this.timerId);
    window.removeEventListener("resize", this.sceenAdapter);
     this.$socket.unRegisterCallBack("sellerData")

  },
  methods: {
    //初始化echartInstance对象
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.seller_ref, this.theme);
      //对图表初始化配置的控制
      const initOption = {
        title: {
          text: "▎商家销售统计",
          left: 20,
          top: 20,
        },
        grid: {
          top: "20%",
          left: "3%",
          right: "6%",
          bottom: "3%",
          containLabel: true,
        },
        xAxis: {
          type: "value",
        },
        yAxis: {
          type: "category",
        },
        tooltip: {
          trigger: "axis",
          axisPointer: {
            type: "line",
            z: 0,
            lineStyle: {
              color: "#2D3433",
            },
          },
        },
        series: [
          {
            type: "bar",
            label: {
              show: true,
              position: "right",
              textStyle: {
                color: "white",
              },
            },
            itemStyle: {
              //颜色渐变
              color: new this.$echarts.graphic.LinearGradient(0, 0, 1, 0, [
                {
                  offset: 0,
                  color: "#5052EE",
                },
                {
                  offset: 1,
                  color: "#AB6EE5",
                },
              ]),
            },
          },
        ],
      };
      this.chartInstance.setOption(initOption);
      // 对图表对象进行鼠标事件的监听
      this.chartInstance.on("mouseover", () => {
        clearInterval(this.timerId);
      });
      this.chartInstance.on("mouseout", () => {
        this.startInterval();
      });
    },
    // 获取服务器的数据
    async getData(res) {
      // const { data: res } = await this.$http.get("seller");
      this.allData = res;
      //对数据进行排序
      this.allData.sort((a, b) => {
        return a.value - b.value; //从小到大排列
      });
      this.totalPage =
        this.allData.length % 5 === 0
          ? this.allData.length / 5
          : this.allData.length / 5 + 1;
      this.updateChart();
      //启动定时器
      this.startInterval();
    },
    // 更新图表
    updateChart() {
      const start = (this.currentPage - 1) * 5;
      const end = this.currentPage * 5;
      const showData = this.allData.slice(start, end);
      const sellerNames = showData.map((item) => {
        return item.name;
      });
      const sellerValues = showData.map((item) => {
        return item.value;
      });
      const dataOption = {
        yAxis: {
          data: sellerNames,
        },
        series: [
          {
            data: sellerValues,
          },
        ],
      };
      this.chartInstance.setOption(dataOption);
    },
    // 开启定时器
    startInterval() {
      if (this.timerId) {
        clearInterval(this.timerId);
      }
      this.timerId = setInterval(() => {
        this.currentPage++;
        if (this.currentPage > this.totalPage) {
          this.currentPage = 1;
        }
        this.updateChart();
      }, 3000);
    },
    //适应屏幕大小
    sceenAdapter() {
      const titleFontSize = (this.$refs.seller_ref.offsetWidth / 100) * 3.6;
      //和分辨率相关的文字大小
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize,
          },
        },
        tooltip: {
          axisPointer: {
            lineStyle: {
              width: titleFontSize,
            },
          },
        },
        series: [
          {
            barWidth: titleFontSize,
            itemStyle: {
              barBorderRadius: [0, titleFontSize / 2, titleFontSize / 2, 0],
            },
          },
        ],
      };
      this.chartInstance.setOption(adapterOption);

      this.chartInstance.resize()
    },
  },
   computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme() {
      // console.log('主题切换');
      this.chartInstance.dispose() //销毁当前的图表
      this.initChart()
      this.sceenAdapter()
      this.updateChart()

    }
  }
};
</script>
<style lang='less' scoped>
</style>